webpack.dev.js

const { merge } = require('webpack-merge');
const path = require('path');
const common = require('./webpack.common');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = merge(common, {
  mode: 'development',
  devtool: 'inline-source-map',
  devServer: {
    static: path.resolve(__dirname, 'dist'),
    open: true,
    port: 8000,
    client: {
      overlay: {
        errors: true,
        warnings: true,
      },
    },
    compress: true,
  },
  module: {
    rules: [
      {
        test: /\.s[ac]ss$/i,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: { sourceMap: true },
          },
          {
            loader: 'sass-loader',
            options: { sourceMap: true },
          },
        ],
      },
    ],
  },
  plugins: [new BundleAnalyzerPlugin()],
});